CN101837240B - Desulfurization system - Google Patents

Abstract

The invention discloses a desulfurization system, comprising: a desulfurization absorption tower, the desulfurization absorption tower includes a tower body, the top of the tower body has a net flue gas outlet and the lower part of the tower body has a mixed liquid outlet; a mixing pipe, the mixing The lower end of the pipe communicates with the lower part of the tower body, and the upper end of the mixing pipe has a flue gas inlet; and a desulfurizing agent nozzle inserted into the mixing pipe to inject desulfurizing agent into the mixing pipe; and an oxidation slurry The oxidation slurry tank has a mixed liquid inlet, an air inlet and a slurry outlet, wherein the mixed liquid inlet is connected with the mixed liquid outlet of the tower body. According to the desulfurization system of the present invention, the mixing effect of the flue gas and the desulfurizer is good, and the desulfurization effect is good.

Description

Desulfurization system

technical field

The invention relates to a desulfurization system, in particular to a desulfurization system using zinc oxide for desulfurization.

Background technique

In the traditional desulfurization process system, the desulfurizer and flue gas are mixed in the absorption tower, the lower part of the absorption tower is provided with a flue gas inlet, and the upper part is provided with a desulfurizer inlet. The flue gas enters the absorption tower from the lower part of the absorption tower and is mixed with the desulfurizer in the absorption tower for desulfurization, and then the desulfurized net flue gas is discharged from the net flue gas outlet at the top of the absorption tower. Due to the large cross-section of the absorption tower, the mixing effect of flue gas and desulfurizer is poor, and the desulfurization effect is not good.

Contents of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art.

Therefore, an object of the present invention is to provide a desulfurization system with good mixing effect of flue gas and desulfurizer and good desulfurization effect.

A desulfurization system according to the present invention includes a desulfurization absorption tower, the desulfurization absorption tower includes a tower body, the top of the tower body has a net flue gas outlet and the lower part of the tower body has a mixed liquid outlet; a mixing tube, the mixing The lower end of the pipe communicates with the lower part of the tower body, and the upper end of the mixing pipe has a flue gas inlet; and a desulfurizing agent nozzle inserted into the mixing pipe to spray desulfurizing agent into the mixing pipe; and an oxidation slurry The oxidation slurry tank has a mixed liquid inlet, an air inlet and a slurry outlet, wherein the mixed liquid inlet is connected with the mixed liquid outlet of the tower body.

According to the desulfurization system of the present invention, by setting the mixing tube on the tower body of the desulfurization absorption tower, since the cross section of the mixing tube is greatly reduced compared with the tower body, the flue gas and the desulfurizer can be fully mixed in the mixing tube, thereby obtaining Better desulfurization effect.

In addition, the desulfurization absorption tower according to the present invention also has the following additional technical features:

The oxidation slurry tank also has an air outlet, and the tower body also has an air inlet connected to the air outlet of the oxidation slurry tank.

The desulfurization system further includes a slurry circulation pump, the outlet and the inlet of the slurry circulation pump are respectively connected with the oxidation slurry tank.

In one embodiment of the present invention, the desulfurization system further includes a process water tank and a slurry storage tank, the process water tank is connected with the oxidation slurry tank to replenish water into the oxidation slurry tank, and the slurry storage tank is connected with the desulfurizer nozzle .

In another embodiment of the present invention, the outlet of the slurry circulation pump is also connected to the desulfurizer nozzle to return a part of the slurry from the oxidation slurry tank to the desulfurizer nozzle.

The inlet of the slurry circulation pump is also connected with the slurry storage tank so as to send the zinc oxide slurry and the part of the slurry in the slurry circulation pump to the desulfurizer nozzle.

The desulfurizer nozzle is inserted into the mixing tube from the flue gas inlet.

The desulfurization absorption tower further includes a flue gas pipe connected to the mixing pipe at the flue gas inlet.

The mixing tube has a reduced-diameter section located below one end of the desulfurizing agent nozzle inserted into the mixing tube. By setting the reduced diameter part, the mixing effect between the flue gas and the desulfurizing agent can be further improved, and the contact between the flue gas and the desulfurizing agent can be made more fully, thereby achieving a further desulfurizing effect.

A mist eliminator is installed in the absorption tower. The demister can be used to filter out the liquid entrained in the purified flue gas in the desulfurization absorption tower, so that the clean flue gas containing less liquid droplets is discharged from the clean flue gas outlet.

Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is a schematic structural view of a desulfurization system according to an embodiment of the present invention;

Figure 2 is a schematic structural view of a desulfurization system according to another embodiment of the present invention; and

Fig. 3 is a schematic diagram of a desulfurization absorption tower of the desulfurization system shown in Fig. 1 and Fig. 2 .

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In the description of the present invention, the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention. There is no requirement that the invention be constructed and operated in a particular orientation, and thus no limitation should be construed.

The following describes a desulfurization system according to an embodiment of the present invention with reference to FIGS. 1-3 .

Firstly, the structure of the desulfurization absorption tower 1 included in the desulfurization system according to the embodiment of the present invention will be described according to FIG. 3 .

The desulfurization absorption tower includes a tower body 11 , a mixing pipe 12 , and a desulfurization agent spray pipe 13 .

There is a net flue gas outlet 111 at the top of the tower body 11 , and a mixed liquid outlet 112 at the lower part of the tower body 11 . In addition, the tower body 11 also has an air inlet 115 , wherein the air inlet 115 is higher than the mixed liquid outlet 112 . In an example of the present invention, a mist eliminator is further provided in the tower body, wherein the mist eliminator includes an upper mist eliminator 113 and a lower mist eliminator 114 spaced up and down. The demister can be used to filter out the liquid entrained in the purified flue gas in the desulfurization absorption tower, so that the clean flue gas containing less liquid droplets is discharged from the clean flue gas outlet 111 . With two layers of mist eliminators, the effect of filtering out the liquid droplets in the purified flue gas is better.

There is a flue gas inlet 121 at the upper end of the mixing tube 12 . The upper end surface of the mixing tube 12 is inclined, that is, the end surface of the flue gas inlet 121 is inclined, and the flue gas enters the mixing tube from the flue gas inlet 121 . In an example of the present invention, a flue gas pipe 14 is connected at the flue gas inlet 121, and the flue gas pipe 14 is connected to the mixing pipe 12 obliquely at the flue gas inlet 121, for example, the flue gas pipe 14 is at the flue gas inlet 121. It is connected with the upper end of the mixing tube 12 to let in flue gas. Those skilled in the art can understand that the flue gas tube 14 can also be regarded as a part of the mixing tube 12 .

The desulfurizing agent nozzle 13 is vertically inserted into the mixing tube 12 , specifically, the desulfurizing agent nozzle 13 is inserted into the mixing tube 12 from the flue gas inlet 121 . A nozzle 131 is provided at the lower end of the desulfurizing agent nozzle 13 to inject desulfurizing agent into the mixing tube 12 . In this way, the desulfurizing agent is sprayed into the mixing pipe 12 through the desulfurizing agent nozzle 13, and mixed with the flue gas to perform the desulfurization process.

The lower end of the mixing tube 12 communicates with the lower part of the tower body 11 . By separating the mixing tube 12 from the tower body 11, the flue gas and the desulfurizing agent are mixed and contacted in the mixing tube 12 for desulfurization. Since the inner diameter of the mixing tube 12 is smaller than the inner diameter of the tower body 11, the flue gas and the desulfurizing agent can The mixing in the mixing tube 12 is sufficient to obtain a better desulfurization effect.

Optionally, the mixing tube 12 can be L-shaped, and one end of the horizontal tube is connected to the lower part of the tower body 11 . In an example of the present invention, the port at one end of the mixing tube 12 connected to the tower body 11 is higher than the mixed liquid outlet 112 .

The mixing tube 12 has a reduced diameter section 122 and an upper tapered section 123 and a lower tapered section 124 . Specifically, the reduced diameter section 122 is connected between the upper tapered section 123 and the lower tapered section 124 , and the reduced diameter section 122 is located below the end of the desulfurizer spray pipe 13 inserted into the mixing pipe 12 . By setting the reduced-diameter section 122, the contact between the flue gas and the desulfurizing agent can be more fully achieved, thereby achieving a further desulfurizing effect. In addition, the length of the upper tapered section 123 may be shorter than the length of the lower tapered section 124 , for example.

In addition, two manholes 116 are provided on the tower body 11 for maintenance.

The following describes a desulfurization system according to an embodiment of the present invention with reference to FIG. 1 , wherein the desulfurization agent is zinc oxide slurry as an example.

The desulfurization system includes a desulfurization absorption tower 1, a booster fan 2, an oxidation slurry tank 3, a slurry circulation pump 4, a process water tank 5, a process water pump 6, a slurry storage tank 7, a slurry storage tank pump 8 and an oxidation fan 9. Wherein, the booster blower 2 is connected with the flue gas pipe 14 of the desulfurization absorption tower 1 so as to pass flue gas into the mixing pipe 12 through the flue gas pipe 14 .

The oxidation slurry tank 3 has a mixed liquid inlet 31, an air inlet 32 and a slurry outlet 33, wherein the mixed liquid inlet is connected with the mixed liquid outlet 112 of the tower body 11, so that the mixed liquid absorbed by the sulfur dioxide can be discharged from the tower body 1 to the oxidation In slurry tank 3. In addition, the oxidation slurry tank 3 also has an air outlet 35, which can be connected with the air inlet 115 on the tower body 11 of the desulfurization absorption tower 1, so that the redundant air in the oxidation slurry tank 3 is passed into the desulfurization absorption tower 1, thereby from the desulfurization. The top of the absorption tower 1 is discharged. The slurry outlet 33 may be connected with the slurry discharge pump 10 for discharging the slurry from the oxidation slurry tank 3 .

The outlet and the inlet of the slurry circulation pump 4 are respectively connected with the oxidation slurry tank 3 to form a loop with the oxidation slurry tank 3, so that the slurry circulation pump 4 extracts the mixed solution in the oxidation slurry tank 3 and sends it back to the oxidation slurry tank 3, thereby enabling Constantly stir the mixed liquor in the oxidation slurry tank 3.

The process water tank 5 is connected to the oxidation slurry tank 3 through the process water pump 6 to replenish water into the oxidation slurry tank 3 . The slurry storage tank 7 is connected to the desulfurization agent nozzle 13 of the desulfurization absorption tower 1 through the slurry storage tank pump 8 , and the slurry storage tank pump 8 sends the zinc oxide slurry in the slurry storage tank 7 into the desulfurization agent nozzle 13 .

The oxidation fan 9 is connected with the oxidation slurry tank 3 to feed air into the oxidation slurry tank 3 . As mentioned above, zinc oxide slurry is mixed with flue gas, zinc oxide reacts with sulfur dioxide in the flue gas to form precipitated zinc sulfite, zinc sulfite and the remaining zinc oxide slurry are discharged into the oxidation slurry tank 3 together, and passed through the oxidation fan 9 Oxygen in the air in the oxidation slurry tank 3 reacts with zinc sulfite to generate zinc sulfate solution.

The following briefly describes the working process of the desulfurization system according to the above-mentioned embodiments of the present invention.

The flue gas is sent into the mixing pipe 12 of the desulfurization absorption tower 1 through the booster fan 2, and mixed with the zinc oxide slurry sent into the mixing pipe 12 of the desulfurization absorption tower 1 by the slurry storage tank 7 through the slurry storage tank pump 8, and then Washing and desulfurization. The desulfurized net flue gas is discharged from the net flue gas outlet 111 of the tower body 11, and the mixed solution (including the generated ZnSO3 and the remaining zinc oxide slurry) after the zinc oxide slurry absorbs sulfur dioxide and sulfur is discharged from the mixed solution outlet of the desulfurization absorption tower 1 112 is discharged into the oxidation slurry tank 3.

Zinc sulfite in the mixed solution in the oxidation slurry tank 3 reacts with the oxygen in the air passed into the oxidation slurry tank 3 by the oxidation fan 9 to form a ZnSO solution that may contain a small amount of ZnSO3 and ZnO. The solution in the oxidation slurry tank 3 is continuously stirred by the slurry circulating pump 4 to fully mix the solution with the oxygen in the air to promote the reaction between oxygen and zinc sulfite and prevent the slurry from settling. In addition, the process water tank 4 supplies water to the oxidation slurry tank 3 through the process water pump 6 . Finally, the ZnSO4 solution is discharged from the outlet of the oxidation slurry tank 3.

A desulfurization system according to another embodiment of the present invention will be described below with reference to FIG. 2 . The difference between the desulfurization system shown in Figure 2 and the desulfurization system shown in Figure 1 is mainly in the connection relationship between the slurry circulation pump 4, the slurry storage tank 7 and the desulfurization agent nozzle 13, so the following will focus on the description of the slurry circulation pump 4, the slurry storage tank The tank 7 and the desulfurizing agent nozzle 13, the description of other identical parts is omitted.

As shown in Figure 2, the outlet and inlet of the slurry circulation pump 4 are connected to the oxidation slurry tank 3 respectively to form a loop with the oxidation slurry tank 3, and the outlet of the slurry circulation pump 4 is also connected to the desulfurizer nozzle 13 of the tower body , to return a part of the slurry from the oxidation slurry tank 3 to the desulfurizer spray pipe 13. The inlet of the slurry circulation pump 4 is also connected to the slurry storage tank 7 through the slurry storage tank pump 8, so that the zinc oxide slurry and a part of the slurry in the slurry circulation pump 4 are sent to the desulfurizer nozzle 13, that is, the slurry storage tank 7. The zinc oxide slurry is not directly sent into the desulfurizer nozzle 13, but is first sent into the slurry circulation pump 4, and then the zinc oxide slurry is sent to the desulfurizer nozzle 13 together by the slurry circulation pump 4.

The working process of the desulfurization system according to the foregoing embodiments of the present invention is:

The flue gas is sent to the mixing pipe 12 of the desulfurization absorption tower 1 through the booster fan 2, and the slurry circulation pump 4 is sent to the zinc oxide slurry in the mixing pipe 12 of the desulfurization absorption tower 1 for mixing, and then washing and desulfurization. The desulfurized net flue gas is discharged from the net flue gas outlet 111 of the tower body 11, and the mixed solution (including the generated ZnSO3 and the remaining zinc oxide slurry) after the zinc oxide slurry absorbs sulfur dioxide is discharged from the mixed solution outlet of the desulfurization absorption tower 1 112 is discharged into the oxidation slurry pool 3.

Zinc sulfite in the mixed solution in the oxidation slurry pool 3 reacts with the oxygen in the air passed into the oxidation slurry pool 3 by the oxidation fan 9 to form a ZnSO solution that may contain a small amount of ZnSO3 and ZnO. The solution in the oxidation slurry pool 3 is continuously stirred by the slurry circulation pump 4 to fully mix the solution with the oxygen in the air to promote the reaction between oxygen and zinc sulfite. In addition, the process water tank 4 supplies water to the oxidation slurry pool 3 through the process water pump 6 . Finally, the ZnSO4 solution is discharged from the outlet of the oxidation slurry pool 3.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.

Claims (9)

1. a desulphurization system is characterized in that, comprising:

Desulfuration absorbing tower, described desulfuration absorbing tower comprises tower body, the bottom that the top of described tower body has clean exhanst gas outlet and tower body has mixture export; Mixing tube, the lower end of described mixing tube is connected with the bottom of tower body, and the upper end of described mixing tube has smoke inlet; And desulfurizer nozzle, described desulfurizer nozzle is inserted in the mixing tube with injection desulfurization agent in mixing tube; With

The oxidation stock tank, described oxidation stock tank has entry to mixed solution, air intake, slurries outlet, wherein said entry to mixed solution links to each other with the mixture export of tower body, and described oxidation stock tank also has air outlet slit, and described tower body also has the air intake that links to each other with oxidation stock tank air outlet slit.

2. desulphurization system according to claim 1 is characterized in that, further comprises slurry circulating pump, and the outlet of described slurry circulating pump links to each other with the oxidation stock tank respectively with entrance.

3. desulphurization system according to claim 2 is characterized in that, further comprises technique water tank and slurry tank, and described technique water tank links to each other with moisturizing in the oxidation stock tank with the oxidation stock tank, and described slurry tank links to each other with desulfurizer nozzle.

4. according to claim 2 or 3 described desulphurization systems, it is characterized in that the outlet of slurry circulating pump also links to each other to turn back in the desulfurizer nozzle from a part of slurries in the oxidation stock tank with desulfurizer nozzle.

5. desulphurization system according to claim 4 is characterized in that, the entrance of described slurry circulating pump also links to each other with described slurry tank in order to the zinc oxide slurries in the slurry circulating pump and described a part of slurries are delivered in the desulfurizer nozzle.

6. desulphurization system according to claim 1 is characterized in that, described desulfurizer nozzle is inserted in the mixing tube from described smoke inlet.

7. desulphurization system according to claim 1 is characterized in that, further comprises fume pipe, and described fume pipe links to each other with described mixing tube at described smoke inlet place.

8. desulphurization system according to claim 1 is characterized in that, described mixing tube has the undergauge section of reduced, described undergauge section be positioned at desulfurizer nozzle be inserted into mixing tube an end below.

9. desulphurization system according to claim 1 is characterized in that, is provided with demister in the absorption tower.

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